While shutting down my Iliad 2nd ed. as usual by depressing de power button, the screen went blank but the green power led keeps burning.

Further depressing the power button long or short, or any other button has no effect whatsoever.
The battery was approx. 90% full when I stopped reading and tried to shutdown the device.
What can I do to shut down completely, or restart the Iliad?

Hans.

Edit:

This morning I found the Iliad with the green led off.

After pushing the power button it started normally.
Let us hope that the troubles are over.
Hans